Seiko 5 Sports SRPK31K1 Automatic 38mm Men's Watch

Seiko 5 Sports SRPK31K1 – Compact Power for Modern Watch Enthusiasts

The Seiko 5 Sports lineup has long been a gateway into the world of automatic watches. Rugged, reliable, and rich in heritage, it continues to capture the hearts of collectors worldwide. The Seiko 5 Sports SRPK31K1 builds on that legacy — but with a refreshing twist: a more compact, wrist-friendly size that appeals to today’s enthusiasts.

If you’ve admired the classic Seiko 5 Sports diver aesthetic but wanted something more wearable for smaller wrists or everyday comfort, the SRPK31K1 might be exactly what you’ve been waiting for.

 

A Modern Take on a Legendary Formula

The Seiko 5 Sports collection traces its origins back to 1963, built around five defining principles: automatic movement, day-date display, water resistance, recessed crown, and durable construction.

The SRPK31K1 carries that DNA forward while responding to one of the most common enthusiast requests — a smaller case size. Where earlier Seiko 5 Sports models typically measured 42.5mm, this reference offers a more versatile and comfortable profile.

 

Case Size & Wearability: Finally, a Compact Option

One of the standout features of the Seiko 5 Sports SRPK31K1 is its balanced dimensions:

· 38mm case diameter

· Approximately 12.1mm thickness

· Around 44mm lug-to-lug

For watch enthusiasts who appreciate proportion and ergonomics, these measurements hit the sweet spot. The 38mm case wears beautifully on wrists of all sizes and delivers a vintage-inspired presence without feeling dated.

The stainless steel case features a mix of brushed and polished surfaces, adding visual interest while maintaining a tool-watch aesthetic. The crown at 4 o’clock — a classic Seiko signature — enhances comfort by preventing wrist bite.

 

Dial & Design: Sporty, Bold, and Versatile

The Seiko 5 Sports SRPK31K1 stays true to the diver-inspired look that made the line famous. It features:

· A bold dial with luminous hour markers

· Generously filled LumiBrite hands

· Day-date display at 3 o’clock

· A unidirectional rotating bezel

The dial layout is clean and legible — exactly what enthusiasts expect from a sport-focused watch. Seiko’s LumiBrite continues to impress, offering strong glow performance in low-light conditions.

The smaller case size gives the watch a slightly more refined and balanced appearance compared to its larger siblings, making it incredibly versatile.

 

Movement: Proven Seiko Reliability

Inside the Seiko 5 Sports SRPK31K1 beats the trusted Seiko 4R36 automatic movement — a workhorse caliber well respected in the enthusiast community.

4R36 Movement Specs:

· 24 jewels

· 41-hour power reserve

· 21,600 vibrations per hour

· Hacking seconds

· Manual winding capability

For many collectors, the inclusion of hacking and hand-winding features is essential — especially compared to older Seiko SKX models that lacked these functions.

While not chronometer-certified, the 4R36 offers dependable daily accuracy and long-term reliability. The exhibition case back adds extra appeal, allowing enthusiasts to observe the mechanical heartbeat of the watch.

 

Build Quality & Water Resistance

The Seiko 5 Sports SRPK31K1 offers 100 meters of water resistance, making it suitable for swimming and everyday water exposure. Although it isn’t ISO-certified as a professional dive watch, it performs more than adequately for daily adventures.

The Hardlex crystal provides durability against impacts, staying consistent with Seiko’s practical design philosophy.

The bracelet feels solid and comfortable, though many enthusiasts enjoy swapping straps to customize the look. The 20mm lug width makes it highly strap-friendly — from NATO straps to rubber or leather options.

 

Everyday Versatility

One of the biggest strengths of the Seiko 5 Sports SRPK31K1 is how easily it adapts to different situations:

· Casual weekend wear

· Office-friendly sporty style

· Travel companion

· Everyday beater watch

The 38mm case ensures it never feels oversized or cumbersome. For enthusiasts who appreciate watches that disappear comfortably on the wrist while still making a statement, this model delivers.

 

Why Watch Enthusiasts Love the SRPK31K1

The watch community has praised this model for several reasons:

1. Ideal Case Size

The 38mm diameter answers years of demand for a smaller Seiko 5 Sports option.

2. Mechanical Value

An in-house automatic movement at an accessible price point remains one of Seiko’s biggest strengths.

3. Classic Diver Styling

It retains the bold DNA of the Seiko sports lineup while feeling more refined.

4. Excellent Lume Performance

Seiko’s LumiBrite continues to outperform expectations.

5. Strap Versatility

With its compact dimensions and standard lug width, customization options are endless.

 

How It Compares to Larger Seiko 5 Sports Models

Compared to 42.5mm variants, the Seiko 5 Sports SRPK31K1 feels more balanced and vintage-inspired. It doesn’t sacrifice legibility or wrist presence — instead, it enhances comfort and proportion.

For collectors who found the larger models too bold, this version feels like a perfectly tuned alternative.

 

Is the Seiko 5 Sports SRPK31K1 Worth It?

For watch enthusiasts seeking an affordable, reliable, and compact automatic sports watch, the answer is a strong yes.

It offers:

· Trusted Seiko heritage

· Robust automatic movement

· Excellent wearability

· Everyday practicality

· Strong value for money

Whether you’re new to mechanical watches or a seasoned collector looking for a comfortable daily wearer, the SRPK31K1 stands out in the competitive entry-level sports watch segment.

Why should I buy the Seiko 5 Sports SRPK31K1 from SecondBit?

We are committed to providing you with authentic and the latest watches. We offer the most reasonable prices possible in Bangladesh. As a trusted watch shop, we provide you with the original Seiko 5 Sports SRPK31K1 timepiece with an international warranty. Buying from SecondBit means not only buying the watch but also investing in reliability, trustworthiness, and a great shopping experience. We don’t just sell watches; we help guide you to find the perfect watch for your wrist.

 

What is the price of Seiko 5 Sports SRPK31K1 in Bangladesh?

The latest price of Seiko 5 Sports SRPK31K1 in Bangladesh is 33,500 Taka. To purchase, visit our showroom or order online through our website.

Final Thoughts

The Seiko 5 Sports SRPK31K1 proves that great design isn’t about size — it’s about balance. By combining the iconic Seiko 5 formula with modern proportions, this watch delivers exactly what many enthusiasts have been asking for.

Compact, reliable, and undeniably versatile, it represents one of the most wearable entries in the Seiko 5 Sports family. For watch enthusiasts who value mechanical charm and everyday comfort, the Seiko 5 Sports SRPK31K1 is a compelling addition to any collection.

FAQ

Can I order Seiko 5 Sports SRPK31K1 online?

Yes. With SecondBit, you can order Seiko 5 Sports SRPK31K1 online. You can pay online with your credit card, debit card, or MFS. You can also make a bank transfer. Cash on delivery is also available; you have to pay 10% of the price in advance. You can pay the remaining amount after receiving

Can I buy the Seiko 5 Sports SRPK31K1 with an EMI plan?

Yes. With SecondBit, you can buy the Seiko 5 Sports SRPK31K1 on EMI. You can avail EMI through 30+ banks and MFS, with flexible plans for easy monthly payments.

What is your Warranty Policy?

You’ll get a 2-year brand warranty with your timepiece. The warranty is void for physical damage and repaired by a third party.

Can I check the product physically?

Yes. Our address is Shop 470, Level 3, Police Plaza Concord Shopping Mall, Gulshan 1, Dhaka, 1211. You can also pick up from our shop. Visit our shop, check the timepiece, ensure authenticity, and then make your decision.

Do you have an instant delivery service?

Yes. SecondBit offers an instant delivery service inside Dhaka City. To avail this service, first you have to pay the whole amount. We will deliver the watch to your address by Pathao/Uber Instant Delivery.